ELM3002-0205 – Safety instructions

Risk of injury due to electric shock/arcing/burning

The following instructions (Part I) must be observed

• The operator must ensure that this product is only installed and operated in perfect working order and by sufficiently qualified and authorized personnel.
• Intended use: industrial, stationary indoor use:
  The ELM3xxx terminals extend the field of application of the Beckhoff Bus Terminal system with functions for measuring sensor signals via voltage, current or resistance. The intended field of application is data acquisition and control tasks in industrial automation. Use of the terminal beyond its intended use is not permitted.
• The decision to use and release for operation must be made by an electrotechnical specialist in accordance with the applicable safety rules (occupational health and safety) for the application. National regulations may have to be observed.
• The cables and plugs used must be in the required measuring category or be approved for the applied voltages. Note: when laying such cables, it may be necessary to comply with installation specifications, such as those specified in EN 60204.
• The metal terminal parts must be connected to the system protectional earth (PE) (supplied M4x8 housing screw and ring cable lug so that at least 2 mm load-bearing thread length in the ELM housing is engaged). A torque of 1 - 1.2 Nm must be applied. Longer screws are not permitted.
• For protection against direct contact, the terminal must be installed in a control cabinet that complies with protection class IP54 or higher in accordance with EN 60529. The control cabinet must be connected to the system protectional earth (PE). The supply of voltages > 60 V DC / 48 V AC when the control cabinet is open is not permitted.
• Do not use the terminal in a damp or explosive environment. Check the installation regularly for contamination.
• When measuring unearthed potentials, an insulation monitor must be provided; operation must be interrupted in the event of an earth fault.
• Check the terminal before, during and after installation and periodically during breaks in operation for visible damage, such as damaged/cracked sockets/cables/plugs and loose parts. If damage is present, commissioning or further operation is prohibited.
• Ensure that the device and the wiring are de-energized on the field and bus side during installation/assembly/testing/disassembly. The 5 safety rules of electrical engineering must be observed:
  - De-energize
  - Secure against reconnection
  - Ensure that no voltage is present
  - Ground and short-circuit
  - Cover or isolate adjacent live parts
• Do not open the terminal or interfere with the interior of the terminal.
• The terminal may only be used in areas with a pollution degree of at least 2 (non-conductive pollution) in accordance with IEC 60664-1.
• The ambient conditions regarding temperature, humidity, heat dissipation, EMC and vibrations, as specified in the operating instructions under technical data, must be observed.

Risk of injury due to electric shock/arcing/burning

The following instructions (Part II) must be observed

• If there is a possibility that the unlocked 4 mm plugs could come loose due to vibration, thereby creating a hazard, the shielding hood ZS9100-0003 (accessory) must be installed or another method of securing the plugs must be used.
• When operating in a warm environment, the terminal housing can become hot; the highly thermally conductive metal surface increases the temperature sensation when touched. Prolonged contact with the surface should then be avoided.
• After final decommissioning or in the event of damage, the terminal must be clearly marked and, if necessary, disposed of in such a way as to prevent hazards from careless use.

Notes on operation

The following instructions must be observed

• The terminal requires a head station (embedded PC, coupler) that generates the E-bus voltage for operation. To ensure that the insulating strength is not exceeded, the potential of the E-bus to the PE potential (housing) must be defined. The terminal therefore has an internal high-resistance connection between PE/SGND and the E-bus. For this reason, the following applies to the selection of the terminal head station
  - EKM1101/ELM9410: possible, since the E-bus supply is electrically isolated
  - EK11xx/EK15xx/CXxxx: these devices generate the E-bus supply without electrical isolation to Us/Up if required. The Us/Up fed in for the supply must either be electrically isolated or grounded (negative pole, ground → PE), there must be no connection to any other potential.
  - Note: In order to meet this specification in a testable manner, it may be useful to operate the terminal(s) on a separate head station.
• The installation of an external transient protection of max. 6 kV is recommended to keep short-term overvoltages away from the measuring instrument. Its functionality must be monitored.
• The terminal mounted on the DIN rail must be covered on the right by either a subsequent terminal or the EL9011 bus end cap.
• SELV/PELV circuits (Safety Extra Low Voltage, Protective Extra Low Voltage) according to IEC 61010-2-201 must be used to supply this device.
• It is recommended to fuse the signal supply lines according to the state of the art, but with a maximum of 1 A.